While they look identical at a glance, the Arcade version is effectively a "hard mode" designed to eat quarters. Key Differences: NES vs. Arcade

This is a faithful emulation of the original Famicom/NES home console version. It includes the familiar level design, infinite continues (via the NSO save state/rewind feature), and the intended learning curve for home play. It’s the version most people grew up with.

On the other hand, if you're a fan of the series or looking for a more curated gaming experience, Super Mario Bros on NSPESHOP is an excellent choice. The series' iconic games, charming graphics, and infectious charm make it a joy to play.

Arcade Archives Super Mario Bros. (eShop): Which Classic Should You Pick?

It swaps out several of the standard NES levels for much harder ones that later appeared in Super Mario Bros.: The Lost Levels Arcade Authenticity: